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This is just due to the way the colour picker works again. Using @xf-publicNavTab--color as a value for something inside a Less template should work fine, and indeed using it as a property value works fine too.

The only issue is that the colour picker only knows about actual colours defined in the color style property group. We don’t attempt to load colours from other properties or sub values of CSS properties so if you use those in the picker they are expected to not resolve to the final colour.